pdahazzard Posted July 29, 2023 Share Posted July 29, 2023 (edited) I have a malfunctioning 31A TCI unit. The only affordable and available TCI is a 58L type. Is there any downside on using that newer TCI? Can it harm? I can't find any differences except this: HCP418 OEM TCI Ignitor Unit oem part # 31A-82305-10-00 small black label lettered: TYPE TID14-19 31A-10 (date code) 3 + 6 terminals Advance curve: 5* +/- 1* at 1050 rpms 7* at 1600 +/- 225 rpms 30* at 2900 +/- 300 rpms 33.5* +/- 2* at 3500 rpms 38.5* +/- 2* at 6000 rpms 39.5* +/- 2* at 6000 rpms 40* at 5500 rpms 36* at 9000 rpms Application: XJ900RK, RL HCP11857 OEM TCI Ignitor Unit oem part # 58L-82305-10-00 small yellow/golden label lettered: TYPE TID14-37 58L-10 (date code) Advance curve: unknown Application: XJ900 N, FN, F I hope someone can shine more light on this. Regards, Martin Edited July 29, 2023 by pdahazzard additional information Link to comment Share on other sites More sharing options...
NE0 Posted July 31, 2023 Share Posted July 31, 2023 hi there, I found the very same data on this website:- https://xjbikes.com/forums/threads/extra-tci-uniits.40084/page-2 which i assume you copied and pasted it from as its in the same format. You ask if there's any downside and can it harm? Well, reading the rest of the thread on the XJbikes forum, member K-Moe writes in to explain : ( copied and pasted across) The advance is telling you when the spark fires in degrees of crank rotation before TDC. Having the wrong advance curve will definitely affect how well the engine runs as spark advance is dependent on the valve timing of the engine. While it is possible to run with spark timing that is different than stock (sometimes it's preferable, depending on the engine), if you get too far off the engine will run very poorly. and it would appear that the advance curve is unknown for the 11857, therefore its also unknown how it would perform in place of the OEM 418. I'd venture to say without that information it would be one of those trial and error situations, i.e give it a go , it may or may not work. However, in view of there being two available, one for the XJ900RK and RL with a different one being listed for XJ900N etc implies there is likely a difference and you may well notice it when fitted. I also noted that on page 1 on the thread there was also a post on testing and repairing TCI units. Good luck, let us know how you get on. Link to comment Share on other sites More sharing options...
Solution NE0 Posted July 31, 2023 Solution Share Posted July 31, 2023 Another option for you martin is to get yours repaired and your 31A-10 is listed here. https://uk.carmo-electronics.com/repair/ecu-tci-cdi-box/caru-ya-xj900f-spark-unit-tid14-37-58l-10-tid14-19-31a-10?___store=carmouk_store_en&___from_store=base_store_en ahhh, this might be of interest.... There is a company in Oz that lists a replacement for your TID14-19 (31A-10) https://www.ecureplacement.com.au/ecu-product/yamaha-xj900rk-seca-tid14-19-ecu-replacement/ and a different listing for the TID14-37 (58L-10) https://www.cdireplacement.com/cdi-products/yamaha-xj900-tid14-37-cdi-replacement/ However, they are both the same price and it may be the same unit? I note the model number listed 000.299.000 S120 45 is the same on both entries. I can see its not cheap, but it may be useful in finding one closer to home or an email to them might be useful to you. Link to comment Share on other sites More sharing options...
pdahazzard Posted August 12, 2023 Author Share Posted August 12, 2023 On 7/31/2023 at 11:21 PM, NE0 said: Another option for you martin is to get yours repaired and your 31A-10 is listed here. https://uk.carmo-electronics.com/repair/ecu-tci-cdi-box/caru-ya-xj900f-spark-unit-tid14-37-58l-10-tid14-19-31a-10?___store=carmouk_store_en&___from_store=base_store_en ahhh, this might be of interest.... There is a company in Oz that lists a replacement for your TID14-19 (31A-10) https://www.ecureplacement.com.au/ecu-product/yamaha-xj900rk-seca-tid14-19-ecu-replacement/ and a different listing for the TID14-37 (58L-10) https://www.cdireplacement.com/cdi-products/yamaha-xj900-tid14-37-cdi-replacement/ However, they are both the same price and it may be the same unit? I note the model number listed 000.299.000 S120 45 is the same on both entries. I can see its not cheap, but it may be useful in finding one closer to home or an email to them might be useful to you. I applied the 58L TCI on my 31A bike and it runs flawless! It feels like I should have done this years earlier, but why should you, when it is not broken? For anyone in doubt to apply a 58L TCI on a 31A: Don’t hesitate! Thanks for your insights, Best regards, Martin Best regards, Link to comment Share on other sites More sharing options...
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